JPS61136047A - Pressure regulating valve - Google Patents

Abstract

PURPOSE:To make it possible to set at once an automatic speed change unit into a power transmittable condition even if the viscosity of hydraulic oil is high, by providing an oil sump in an oil passage for feeding-back regurated hydraulic pressure. CONSTITUTION:A fixed volume oil sump 30 communicated with a part of feedback pressure effecting port side is provided in an oil passage for feeding- back regulated hydraulic pressur downstram of a throttle valve 20. With this arrangement, a certain time elapses until a feedback oil flowing into through the throttle valve 20 just after starting of an engine is filled in the sump 60 to delay the rise of hydraulic pressure so that a pressure regulating valve 10 is held in a condition which has been set before initiation of pressure regulating operation, and therefore, no oil drain is effected, thereby the hydraulic oil becomes in its maximum condition. Accordingly, after starting of the engine the line pressure comes to be very high, and therefore the automatic speed change unit may be set at once in its power transmittable condition even if the viscosity of hydraulic oil is high.

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a pressure regulating valve.

(b) Conventional technology In hydraulic control devices for automatic transmissions, for example,
Pressure regulating valves such as the throttle valve and regulator valve shown in Japanese Patent No. 954 are used, but such conventional pressure regulating valves are not provided with a mechanism for variable control of oil pressure over time.

Therefore, theoretically, if other conditions are constant, the oil pressure will be regulated to the same value as in a steady state even immediately after startup.

(c) Problems to be solved by the invention However, when the above pressure regulating valve is used as a regulator valve, throttle valve, etc. of an automatic transmission,
Since the viscosity of the oil becomes high in a very low temperature state (for example, about -10° C. or lower), there is a problem in that the automatic transmission cannot immediately be brought into a state in which transmission is possible. In other words, even if you set the selector to the drive range immediately after starting operation of the automatic transmission in a cold state, the viscosity of the oil is high, so it will take time for the oil to flow into the clutches, brakes, etc. and act on them. As a result, the automatic transmission is not immediately ready to transmit power.

The purpose of the present invention is to solve the above-mentioned problems and to obtain a pressure regulating valve whose pressure regulating value is higher than in normal cases immediately after startup, and to apply this to a hydraulic control device of an automatic transmission. By applying this, the automatic transmission can be immediately put into a state where it can transmit power.

(d) Means for Solving the Problems The present invention solves the above problems by delaying the action of feedback oil pressure on the pressure regulating valve immediately after startup. That is, the pressure regulating valve according to the present invention has an oil pool having a predetermined volume on the lower side of the throttle valve of the oil passage that feeds back the regulated hydraulic pressure. The oil reservoir is composed of, for example, an oil chamber, an accumulator, and a long pipe.

(E) Effect With the above configuration, it takes time for the oil reservoir to be filled with the feedback oil that is charged through the throttle valve immediately after startup, so the rise of oil pressure is delayed, and the pressure regulating valve is maintained at the state before the start of the pressure regulating action, oil is not drained, and the oil pressure is at its highest state. If the regulator valve that regulates the line pressure of an automatic transmission is used as this pressure regulating valve, the line pressure will be extremely high immediately after starting, and even if the oil viscosity is high, the oil will not flow to the clutches, brakes, etc. is rapidly supplied, and the automatic transmission is immediately ready to transmit power. When the oil reservoir is filled with oil that has flowed in through the throttle valve, feedback hydraulic pressure is applied to the pressure regulating valve to bring it into a pressure regulating state, and the normal pressure regulating action is performed. Note that if the throttle valve is a choke type throttle valve, the throttle effect will be greater at low temperatures and the oil pressure can be maintained at a high level for a relatively long time.On the other hand, if the engine is started with a high oil temperature, Since the resistance of the throttle valve is small, the feedback hydraulic pressure acts quickly, and the pressure regulating valve starts regulating pressure relatively early.

(F) Embodiments Hereinafter, embodiments of the present invention will be described based on Nos. 1 to 6M of the accompanying drawings.

(First Embodiment) FIG. 1 shows a regulator valve 10 which is a pressure regulating valve of the present invention. The regulator valve 10 has a valve hole 12
The spool 14 inserted into the valve hole 12, the hollow sleeve 16 similarly inserted into the valve hole 12, the plug 18 fitted into the inner diameter of the sleeve 16, and the first
It consists of a spring 22 that applies an upward force in the figure. The valve hole 12 has holes 12a to 12h. Port 12a is a port to which line pressure is supplied as necessary. po h12b, 12c and 12
e is connected to a line pressure oil passage 26 to which oil discharged from the oil pump 24 is supplied.

However, a choke-type throttle valve 20 is provided at the inlet of the feedback port 12b.

The choke-type throttle valve 20 is a throttle valve that is long in length compared to its cross-sectional area. An oil chamber 6o, which is an oil reservoir, is provided between the choke type throttle valve 2o and the port 12b. Oil chamber 6
0 has a volume of a predetermined size. The oil chamber 60 can communicate with the atmosphere via a one-way valve 62. Poe) 12d
is a port from which oil from the port 12c is discharged, and the oil discharged to this port 12d is supplied to, for example, a torque converter via an oil passage 27. Port 12f is a drain boat from which oil is drained from port 12e.

The port 12g is connected to an oil passage 28 to which hydraulic pressure is supplied when a manual valve (not shown) is in the R range (reverse travel range). 12h is connected to an oil passage 29 to which a throttle pressure that changes depending on the engine load is supplied. The spool 14 has lands 14a to 14e
have. Lands 14c, 14d, and 14e have the same diameter, land 14b has a smaller diameter than these, and land 14a has an even smaller diameter than land 14b.

The hydraulic pressure of the port 12a acts on the pressure receiving portion formed between the land 14a and the land 14b, and the hydraulic pressure of the port 12b acts on the feedback pressure receiving portion formed between the land 14b and the land 14c. Sleeve 16 has a stepped inner diameter to which land 18 of plug 18 is attached.
a and 18b are fitted together. The land l8b has a smaller diameter than the land 18a. The sleeve 16 is provided with a passage passing through its inner and outer peripheries, and the hydraulic pressure of 12h acts on the end surface of the land 18b, and the hydraulic pressure of 12g
The hydraulic pressure is applied to a pressure receiving portion formed between the land 18a and the land 18b.

Next, the operation of this embodiment will be explained.

In regular use, the regulator valve 10
has the following effect. A downward force is applied to the spool 14 of the regulator valve 10 by the hydraulic pressure acting on the ports 12a and 12b, while the
g and the hydraulic pressure acting on the port 12h exert an upward force of a force acting through the plug 18 and a force due to the spring 22. The spool 14 discharges the oil from the ports 12c and 12e to the ports 12d and 12f so that the downward force and the upward force are balanced, thereby performing a well-known pressure regulating action. As a result, the line pressure of the oil passage 26 is regulated as specified.

Immediately after starting after stopping for a certain period of time, the following effects are obtained. During the stop, the oil in the oil chamber 60 is discharged to the outside, and before starting, there is no oil pressure acting on the port 12b, so the spool 14 is pushed by the spring 22 and moves to the uppermost position in Fig. 1. The situation is as follows. When started in this state, the oil pump 24 starts discharging oil into the oil passage 26. Oil choke type throttle valve 2
0, flows into the oil chamber 60 and is filled with the port 12b.
It takes some time for the hydraulic pressure to act on the spool 14 and push the spool 14 down. Until the spool 14 is pushed down to the pressure regulating position, the ports 12d and 12f are closed by the lands 14d and 14e, respectively, so the oil in the oil passage 26 is not drained and the oil in the oil passage 26 is closed.
line pressure is extremely high. Therefore, regardless of the viscosity of the oil, oil can rapidly flow into the clutch, brake, etc., and the automatic transmission can immediately be brought into a state where transmission is possible. After the oil pressure acts on the port 12b and the regulator valve 10 enters the pressure regulating state, the normal pressure regulating action is performed.

In addition, the choke-type throttle valve 20 has a greater throttling effect as the oil temperature is lower and the viscosity is higher, so it can maintain a high pressure state for a longer time at low temperatures, improving the response delay of automatic transmissions at low temperatures. can do. On the other hand, when starting with a rise in oil temperature, the flow rate passing through the choke-type throttle valve 20 increases significantly, so the regulator valve 10
The pressure is regulated relatively early, and unnecessarily high oil pressure is prevented from being output.

(Second example) FIG. 2 shows a second embodiment of the invention.

In this embodiment, the present invention is applied to a throttle valve 30 of an automatic transmission. The throttle valve 30 is
It has a spool 34 inserted into a valve hole 32.

The valve hole 32 has ports 32a-32d. The port 32b and the port 32d communicate with a throttle pressure oil passage 44 to which regulated throttle pressure is supplied. A choke-type throttle valve 2o is provided at the inlet of the port 32d. An oil chamber 60 is provided between the choke type throttle valve 20 and the port 32d. The oil chamber 60 is a one-way valve 62
It can communicate with the atmosphere through. Line pressure serving as a hydraulic pressure source is supplied to the port 32c from an oil passage 42. port 3
2a is a drain boat. The spool 34 has lands 34a and 34b of the same diameter. The axial dimension of the groove between lands 34a and 34h is approximately equal to the wall distance between ports 32a and 32C. A pushing force from a vacuum diaphragm 50 is applied to the spool 34 via a rod 48. The vacuum diaphragm 50 has the function of applying a force to the rod 48 that is inversely proportional to the engine intake pipe negative pressure applied from the pipe 52. With this configuration, the throttle valve 30 regulates the oil pressure in the oil passage 44 so that the downward force acting from the rod 48 and the upward force due to the oil pressure in the port 32d are balanced. At the entrance of port 32d, there is a first
Since the same choke-type throttle valve 20 and oil chamber 60 as in the embodiment are provided, the bow will not occur immediately after startup (especially at low temperatures).
32d's oil pressure rise was delayed, and port 32b and boat 3
2c, the throttle pressure in the oil passage 44 becomes the same oil pressure as the line pressure in the oil passage 42. Since the line pressure is regulated by a regulator valve (not shown) using this throttle pressure, the line pressure is at its highest immediately after startup, and the same operation and effect as in the first embodiment can be obtained. .

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention. In this third embodiment, a throttle valve 64 is provided in place of the one-way valve 62 of the first embodiment shown in FIG. Since the throttling effect of the throttle valve 64 is greater than that of the choke-type throttle valve 2o, less oil is discharged through the throttle valve 64, and the first
The same effect as in the embodiment can be obtained. That is, when the operation is stopped, the oil in the oil chamber 6o is discharged through the throttle valve 64, while during operation, the oil chamber 60 is filled with oil supplied through the choke-type throttle valve 2o, and a part of the oil is discharged through the throttle valve 64. However, since oil is always replenished, the oil pressure in the oil chamber 60 and the boat 12b becomes approximately equal to the oil pressure in the oil passage 26.

In this third embodiment as well, the same effect Φ as in the first embodiment can be obtained.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention. This fourth embodiment is similar to the oil chamber 6° and the one-way valve 6 of the first embodiment shown in FIG.
2 is replaced with an accumulator 66. In this fourth embodiment as well, the oil in the accumulator 66 is drained during the stoppage, and is filled over a predetermined period of time immediately after the start, and after the inside of the accumulator 66 is filled with oil, line pressure is applied to the boat 12b. Therefore, the same effect as in the first embodiment described above can be obtained.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment of the present invention. In this fifth embodiment, a long pipe line 68 is provided in place of the oil chamber 6o of the first embodiment shown in FIG. It is clear that the same effect can be obtained if the volume of the pipe line 68 is made equal to the volume of the oil chamber 60.

(Sixth Embodiment) FIG. 6 shows a sixth embodiment of the present invention. In this sixth embodiment, a long pipe line 68 is provided in place of the oil chamber 60 of the third embodiment shown in FIG. It is clear that the same effect can be obtained if the volume of the pipe line 68 is made equal to the volume of the oil chamber 60.

Although all of the embodiments described use the choke type throttle valve 20, an orifice type throttle valve may be used instead. However, in this case, the effect of delaying the action of the feedback oil pressure cannot be obtained at low temperatures, and the oil pressure remains high for almost the same amount of time at low temperatures as at high temperatures.

(G) As described in detail, according to the present invention, since the oil pool is provided in the feedback oil path of the pressure regulating valve, the pressure regulating value can be increased immediately after starting, for example, when the regulator valve or When the present invention is applied to a throttle valve, it becomes possible to increase the line pressure immediately after startup and supply oil to clutches, brakes, etc. at full speed even at low temperatures, and the automatic transmission can immediately be powered up. It can be in a state where it can be transmitted. Further, if a choke type throttle valve is used as the throttle valve, the above effect can be made remarkable especially at low temperatures.

[Brief explanation of drawings]

1 is a diagram showing a first embodiment of the present invention, FIG. 2 is a diagram showing a second embodiment of the present invention, FIG. 3 is a diagram showing a third embodiment of the present invention, and FIG. 4 is a diagram showing the present invention. FIG. 5 is a diagram showing a fourth embodiment of the invention, FIG. 6 is a diagram showing a fifth embodiment of the invention, and FIG. 6 is a diagram showing a sixth embodiment of the invention.
It is a figure showing an example. 10...Regulator valve (pressure regulating valve), 20...
...Choke type throttle valve, 30...Throttle valve (
Pressure regulating valve), 60 φ oil chamber (oil pool).

Claims (1)

[Claims] 1. In a pressure regulating valve that adjusts the hydraulic pressure by feeding back the regulated hydraulic pressure and applying it to the spool and adjusting the drain opening, a restriction of the oil passage that feeds back the regulated hydraulic pressure is provided. A pressure regulating valve characterized in that an oil reservoir having a predetermined volume is provided on the downstream side of the valve and communicates with a portion on the feedback pressure application port side. 2. The pressure regulating valve according to claim 1, wherein the throttle valve is a choke type throttle valve. 3. The pressure regulating valve according to claim 1 or 2, wherein the pressure regulating valve is a regulator valve for regulating line pressure of an automatic transmission hydraulic control device.